Robustness As I don't have seatruth data, apart from the above speaker_harris_fig_01.png, I used results obtained on lsiOLI_20140129 as a seatruth DTM The result is astounding, knowing that part of the fuzziness is caused by slight misregistration of the PAN band. No smoothing applied

Regression February 4th 2016 vs Jan 29th 2014 This is a test of the robustness of 4SM

ZR-0.50m - ZCFebruary 4th 2016 - Jan 29th 2014

Discrepancies Three specific sources of discrepancies must be considered

Cloud shadows: they cause over-estimation of retrieved depths. I could not find a way to avoid it.

Misregistration: the 30 m re-sampled PAN band is misregistrated by one pixel in both row and line. This causes fuzziness, and overestimated depths on occasion.

Variation of water optical properties: they cause local over -or under- estimation of retrieved depth

Robustness The results are much more robust than I expected! I intend to produce a Combined Depth raster out of all these results.

Data and Deglinting

TOA TCC: raw image logaritmmic enhancement

BOA TCC deglinted image logaritmmic enhancement

Winter is the time of choice

Clear atmosphere, hardly any glint

Homogeneous waters, particularly Blue bands (most unusual), from Exuma Sound to Tongue Of The Ocean and to open ocean

No local patch of discoloured waters,

although the PAN band comes to near extinction between waypoints B2 and B3, where depth is 5-7 m